问题
选择题
| 下列等式，能够成立的是（ ） |
A.（x-y）2=（-x-y）2 B.（x-y）2=（y-x）2 C.（m-n）2=m2-n2 D.（x-y）（x+y）=（-x-y）（x-y） |
答案
答案：B
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| 下列等式，能够成立的是（ ） |
A.（x-y）2=（-x-y）2 B.（x-y）2=（y-x）2 C.（m-n）2=m2-n2 D.（x-y）（x+y）=（-x-y）（x-y） |
答案：B
| 从方框中选择合适的词，并用正确的时态填空。 | |
1. Our English teacher always _____ us to read English crazily. 2. When I got home yesterday, Mum _____ the floor in the kitchen. 3. Mr Wang with his students _____ their plans for the winter holidays at the moment. 4. At last, my father _____ to buy me a new computer as a new year present. 5. —Are you still working on the project? —Yes, and I _____ it in half an hour. |